Comment 3 for bug 1870947

https://packaging.ubuntu.com/html/fixing-a-bug.html probably still applies.

However, expanding the version numbers for recent releases on https://launchpad.net/ubuntu/+source/dstat shows, in "Publishing details", shows:
"Copied from debian sid in Primary Archive for Debian GNU/Linux."

So this is a direct copy from Debian - in such cases it's good to check whether this very bug has already been fixed in Debian, in which case another sync to Ubuntu may be in order. Or whether you can contribute the fix to Debian, who have kindly provided the package, then have Ubuntu sync the updated package again. See the right-hand column on https://packages.debian.org/sid/dstat for a link to the Debian bug tracker and additional info on the package state in Debian.

https://wiki.ubuntu.com/SyncRequestProcess